453,437 views
26 votes
26 votes
Question
the value of 2 cos x - cos 3x - cos 5x is
not spam


User Abhriya Roy
by
2.6k points

1 Answer

25 votes
25 votes

Solution -:

Required Answer -:

16cos³ x sin² x

Let's Begin

2cos x - ( cos 3x + cos 5x )

= 2cos x - 2 cos 4x cos x

= 2cos x 2sin² 2x

= 4 cos x ( 2sin x cos x)²

= 16cos³ x sin² x

Thus,, the value of 2 cos x - cos 3x - cos 5x is = 16cos³ x sin² x

User HuangJie
by
3.1k points